Why my motor blew up...

So i felt like tearing into my 74 k5 with the blown up, fairly new sbc 400...

I took the intake off and foound shrapnel, aluminum shrapnel...
I then pulled the pass side head and found what was left of the number 4 piston... in 6 big chunks, the rest fell inside the block... The rod twisted to a 20 degree angle and punched a clean hole in the block... looks really cool... Looks like the piston caved in around the rod...

the rings were wrapped around the rod.... /forums/images/graemlins/shocked.gif

Anyone know what caused this?

I was going down the road at 40 maybe 45 MPH...
Tacking about 2500?
I wasnt getting on it or anything... /forums/images/graemlins/angryfire.gif

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